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' The Splitro series is a member of the loamy, mixed family of LTthTC Cryoborolls. Typically, Splitro ~~ ~ soils are noncalcereous throughout and have brown very friable granular A horizons and brown fine Bendy -- loam B2 horizons having brighter chrome end moderate structure over hard quartzitic sandstone at depth ~' of 16 inches. Typifying Pedon: Splitro sandy loam - grassland (Colors are for dry soil unless otherwise noted.) .. Al D-8"--Brown (7.SYR 5/3) sandy loam, dark brown (7.SYR 3/3) moist; moderate fine crumb structure; soft, very friable; scattered Sandstone fragments on the surface; neutral (pH 6.8); clear smooth boundary. (6 to 15 inches thick) . 82 B-16"--Brain (7.SYR 5/4) tine sandy loam, dark brown (7.SYR 4/4) moist; moderate coarse sub- • angular blocky structure; slightly hard, Very friable; 5 percent sandstone fragments; neutral (pH 6.8j; abrupt smooth boundary. (0 to 10 inches thick) ~ ~ R 16"--Hard quartzitic sandstone. Type Location: Johnson County, Wyoming; NE1/4 NEl/4 sec;. 30, T.45N., R.85W. P.an~e in Characteristics: The mollic epipedon ranges cram 6 to 15 inches thick, the solum ranges fran '- 10 to ibinc e i iii Tcc, and depth, to bedrock ranges fromll0 to 20 inches, Organic carbon in the motlic epipedon ranges from 1 to 6 percent and decreases uniformly with increasing depth. These soils are 80 [e 700 percent base-saturated. The control section 15 typically sandy loam but clay ranges from 5 to ~ ~. 18 percent, silt from 5 to 40 percent, and sand from 50~to 62 percent with more than 35 percent being fine sand or coarser. Rock fragmentr range from 5 to 3'.~ percent. Mean annual Boll temperature ranges from 32° to 47° F. and mean runner soil temperature front 4D° to 59° F. The Al horizon has hue of lOYR or 7.SYR, valve of 4 or ' dry, 2 or 3 moist, and chrome of 2 or 3. It is slightly acid to mildly alkaline (DH 6.1 to 7.5 ). TMs horizon usually her crunb Drimary structure but ranges to subangular blocky. It 1s soft to slightly hard. UsuaTiy tt has higher value, or brighter chrome in the lower part than in the upper if the 62 horizon is absent. i , _ The 62 horizon, when present, has hue of lOYR through 51'R, value of 4 or 5 dry, 5 or 6 moist, and chrome of 3 through 5. When the hue exceeds 7.SYR such colorsshould be confined to the horizons of maximum weathering. This horizon 1s slightly acid to mildly alkaline (pH 6.1 to 7.5). Usually 1t has sub- angular blocky primary structure but Tt has weak prismatic structure 1n some pedons. Coin etino Series and their Differentiae: These are thelDuncom, Hazton, Jenkinson, and Trump series. ~ uncom sots eve con rnuous on zoos of secondary carbonate accumulation and have more than 18 percent l i i • ar gran t c clay in the control section. Hazton soils have a high jrercentage of medium and coarse angu sand and have C horizons that are very hard when dry. Jenkinson Bolls are calcareous throughout end are moderately or strongly alkaline. Truce soils are calcareous immediately above the bedrock and have more than 18 percent clay in the control section. Settin Splitro soils are on moderately to steeply sl~~ping upland hills and ridges in areas where sandstone occurs near the surface. Slope gradients range from 5 to 30 percent. The soil formed 1n t t l ~ - oca- ype he moderately coarse materials weathered from the underlyi)ig, noncalcareous sandstone. At i th i n ng e tion average annual precipitation is 20 inches, with peek periods of precipitation occurr ° _ F. spring and early summr. Mean annual temperature is 31i' F. and mean summer temperature 1s 50 Princi al Associated Soils: These are the Sawcreek andlPasscreek soils. Passcreek soils have sn argillic hon zoo. awcreek soi15 have bedrock at depthis of 20 to 40 inches. Orainaae and Permeability: Nell-drained; slow runoff; moderate to rapid permeability, • Use and Yeyetation: These soils are used principally afs native pastureland or for recreational purposes. . ~ T~tive vegetation is green needlegrass, Idaho fescue, and yarrow. Distribution and Extent: The Bighorn Mountain areas of~ north-central Nyaming and the western slope of Co ore o. a serves s of moderate extent. Series Established: Lower Colorado Ares, [olorado 1970. ~ Nitlonal Cooperative Soil Survgy ' U. 5. A.